Catch Losses and Reduction of Bycatch for Jellyfish Using Marine Mammal Bycatch Reduction Devices in Midwater Trawl Gear
The National Institute of Fisheries Science in Korea is developing marine mammal bycatch reduction devices (BRDs) for midwater trawl gear. In this study, we tested two BRD-type guide nets (inclined net panel) with 30° and 45° tilt angles to prevent marine mammals from reaching the codend and facilit...
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MDPI AG
2025-06-01
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| Series: | Fishes |
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| Online Access: | https://www.mdpi.com/2410-3888/10/6/276 |
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| author | Jung-Mo Jung Hyun-Young Kim Bong-Jin Cha Sung-Jae Kim Tae-Suk Kim Gyeong-Cheol Hyun Kyu-Suk Choi |
| author_facet | Jung-Mo Jung Hyun-Young Kim Bong-Jin Cha Sung-Jae Kim Tae-Suk Kim Gyeong-Cheol Hyun Kyu-Suk Choi |
| author_sort | Jung-Mo Jung |
| collection | DOAJ |
| description | The National Institute of Fisheries Science in Korea is developing marine mammal bycatch reduction devices (BRDs) for midwater trawl gear. In this study, we tested two BRD-type guide nets (inclined net panel) with 30° and 45° tilt angles to prevent marine mammals from reaching the codend and facilitating their escape from the net. Fishing operations were conducted along the east and south coasts of South Korea, and cameras were installed in front of the BRDs to monitor their performance. The catch loss of herring with the 30° guide net was 13% and 11% in number and weight. The catch loss of hairtail was 53% and 51% in number and weight with the 30° guide net. Mackerel showed a 97% catch loss in number and weight with the 45° guide net. The 30° guide net resulted in lower catch loss for rudderfish and jack mackerel compared to the 45° guide net. The jellyfish discard rate of the BRD was 5% and 7% in number and weight with the 30° guide net and 12% and 11% with the 45° guide net, indicating that the 30° guide net was more effective at discarding jellyfish. Mesh selectivity was not strongly related to target species body length. |
| format | Article |
| id | doaj-art-d6cb4db1807c4cf599355da05dd80970 |
| institution | OA Journals |
| issn | 2410-3888 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fishes |
| spelling | doaj-art-d6cb4db1807c4cf599355da05dd809702025-08-20T02:21:09ZengMDPI AGFishes2410-38882025-06-0110627610.3390/fishes10060276Catch Losses and Reduction of Bycatch for Jellyfish Using Marine Mammal Bycatch Reduction Devices in Midwater Trawl GearJung-Mo Jung0Hyun-Young Kim1Bong-Jin Cha2Sung-Jae Kim3Tae-Suk Kim4Gyeong-Cheol Hyun5Kyu-Suk Choi6Division of Fisheries Engineering, National Institute of Fisheries Science, Busan 46083, Republic of KoreaDivision of Fisheries Engineering, National Institute of Fisheries Science, Busan 46083, Republic of KoreaDivision of Fisheries Engineering, National Institute of Fisheries Science, Busan 46083, Republic of KoreaDivision of Fisheries Engineering, National Institute of Fisheries Science, Busan 46083, Republic of KoreaDivision of Fisheries Engineering, National Institute of Fisheries Science, Busan 46083, Republic of KoreaDivision of Fisheries Engineering, National Institute of Fisheries Science, Busan 46083, Republic of KoreaDivision of Fisheries Engineering, National Institute of Fisheries Science, Busan 46083, Republic of KoreaThe National Institute of Fisheries Science in Korea is developing marine mammal bycatch reduction devices (BRDs) for midwater trawl gear. In this study, we tested two BRD-type guide nets (inclined net panel) with 30° and 45° tilt angles to prevent marine mammals from reaching the codend and facilitating their escape from the net. Fishing operations were conducted along the east and south coasts of South Korea, and cameras were installed in front of the BRDs to monitor their performance. The catch loss of herring with the 30° guide net was 13% and 11% in number and weight. The catch loss of hairtail was 53% and 51% in number and weight with the 30° guide net. Mackerel showed a 97% catch loss in number and weight with the 45° guide net. The 30° guide net resulted in lower catch loss for rudderfish and jack mackerel compared to the 45° guide net. The jellyfish discard rate of the BRD was 5% and 7% in number and weight with the 30° guide net and 12% and 11% with the 45° guide net, indicating that the 30° guide net was more effective at discarding jellyfish. Mesh selectivity was not strongly related to target species body length.https://www.mdpi.com/2410-3888/10/6/276midwater trawlmarine mammalbycatch reduction devicecatch lossjellyfish bycatch |
| spellingShingle | Jung-Mo Jung Hyun-Young Kim Bong-Jin Cha Sung-Jae Kim Tae-Suk Kim Gyeong-Cheol Hyun Kyu-Suk Choi Catch Losses and Reduction of Bycatch for Jellyfish Using Marine Mammal Bycatch Reduction Devices in Midwater Trawl Gear Fishes midwater trawl marine mammal bycatch reduction device catch loss jellyfish bycatch |
| title | Catch Losses and Reduction of Bycatch for Jellyfish Using Marine Mammal Bycatch Reduction Devices in Midwater Trawl Gear |
| title_full | Catch Losses and Reduction of Bycatch for Jellyfish Using Marine Mammal Bycatch Reduction Devices in Midwater Trawl Gear |
| title_fullStr | Catch Losses and Reduction of Bycatch for Jellyfish Using Marine Mammal Bycatch Reduction Devices in Midwater Trawl Gear |
| title_full_unstemmed | Catch Losses and Reduction of Bycatch for Jellyfish Using Marine Mammal Bycatch Reduction Devices in Midwater Trawl Gear |
| title_short | Catch Losses and Reduction of Bycatch for Jellyfish Using Marine Mammal Bycatch Reduction Devices in Midwater Trawl Gear |
| title_sort | catch losses and reduction of bycatch for jellyfish using marine mammal bycatch reduction devices in midwater trawl gear |
| topic | midwater trawl marine mammal bycatch reduction device catch loss jellyfish bycatch |
| url | https://www.mdpi.com/2410-3888/10/6/276 |
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